Removing spurious entities from an AutoCAD drawing

1) Thaw and turn on all layers.

2) Make sure all layers are assigned a visible color.

3) Zoom Extents. The drawing should fill the screen Is there unexpected blank space around the screen image? If so, there are probably hard to see entities like points in the drawing.

4) Remove excess items.

5) Zoom extents. The expected drawing should fill the screen. If not, Repeat as required.